What is the role of VIP in driving test?

The VIP of driving test is still very useful. I didn't have a member at the beginning. I have more than 1700 questions in subject 4, and I feel hopeless after doing 200 questions. I really have no confidence. I spent 45 yuan on the vip of subject 4, and I shortened 500 questions, wrong 100. I have made it clear why I made a mistake in every question, so I don't need to recite it specially. I feel that this 45 is well spent, which saves my time and the test questions are much simpler than those in the driving test book.